M320 Host Subsystem Description
The host subsystem provides the routing and system management functions of the router. You can install one or two host subsystems on the router. To operate, each host subsystem functions as a unit; the Routing Engine requires the corresponding Control Board (CB) and vice versa.
 | Note: We recommend that you install two host subsystems for redundant protection. If you install only one host subsystem, we recommend that you install it in slot RE0. |
| Note: Each host subsystem has three LEDs that display its status. The LEDs that report host module status (including Routing Engine status) are located in the middle of the craft interface rather than the Routing Engine faceplate. For more information about the host subsystem LEDs, see M320 Craft Interface Host Subsystem LEDs. |
| Note: For specific information about Routing Engine components (for example, the amount of DRAM), issue the show chassis routing-engine command. |
| Note: If two Routing Engines are installed, they must both be the same hardware model. |
